/*字体样式*/
.my_font{
    font-style: italic;
    font-weight: bolder;
    font-size: 2.75em;
    font-family: 华文楷体, Serif;
    /*line-height: 5em;    5*2.75*16px=220px */
    line-height: 5rem; /*5px*16=80px*/
}

/*文本样式*/
.my_text{
    border: 1px solid black;
    width: 30em;
    height: 10rem;
    letter-spacing: 1rem;
    line-height: 2rem;
    text-indent: 1rem;
    text-align: center;
    vertical-align: middle;
}
/*颜色样式*/
.my_color{
    border: 1px solid black;
    width: 30rem;
    height: 10rem;
    color: blueviolet;
}

/*背景样式*/
.my_bg{
    border: 1px solid black;
    width: 50rem;
    height: 20rem;
    background :#c82333 url("https://www.baidu.com/img/bd_logo1.png") no-repeat center center;
}

/*列表样式*/
.my_list{
    list-style-type: none;
    list-style-image: url("http://www.jju.edu.cn/images/ico1.gif");
}

/*盒子模型*/
.my_box{
    width: 50rem;
    height: 20rem;
    border: 1px solid black;
    margin: 1rem 1rem ;
    padding: 1rem;
}